Jack



JOHN W. BATE, F RACINE, WISCONSIN.

JACK.

To all lwhom t may concern.;

Be it known that I, J oHN W. BATE, a citizen of the United States,residing at Racine, in the county of Racine and .State of Wisconsin,have invented a new and useful Improvement in Jacks, of which thefollowing is a specification.

This invention relates to jacks and p ar-A ticularly to the racks usedin the lifting` member of'jacks. The invention vis fully described inthe following specification and shown in the accompanying drawings, inwhich- A Figure 1 is a side elevation of the lifting jack showing thelifting member and operating mechanism partly in section.

F ig..2 is a partial perspective veiw of the back of the rack shown inFig. 1.

. Fig. 3 is a transverse section on the line 3 of Fig. 1.

Fig. 4 is a partial vertical section through a modified form of liftingmember and rack.

Fig. 5 is a transverse section on the line 5 of F1g. 4; and

Fig. 6 is a partial perspective view of the rack shown in Fig. 4.

This jack consists of a Vcasing A in which is slidably mounted a liftingmember 10 which is U-shaped in cross-section as shown in Fig. 8. Astamped metal rack 11 is secured in the bottom of the lifting member 10by means of rivets 12. As an additional fastening means I have alsoturned the ends 13 of the rack 11 and passed them through openings 14 inthe bottom of the U-shaped lifting member. These ends are then rivetedover to retain them.

This rack has teeth 15 formed upon its edges and these are turnedatright angles to the body of the rack 11 so as to form a shallow U-shapedsection as shown in Fig. 3.

A liftin mechanism is carried by the casing IA an has pawls 16 and 17which may be operated -in any desirable manner to lift the member 10 inany well known manner.

These pawls engagethe teeth lwhich are made appreciably narrower thanthe inside distance between the flanges of the U-shaped lifting member10 as is shown in Fig. 3. This -permits the pawls to overhang the edgesof the rack teeth. i Figs. 4, 5 and 6 show a modified form of liftingmember 10a of U-shape cross-section having a solid rack 18 secured inthe bottom thereof by means of rivets' 19. This rack may have its teethcast or milled therein. While I have shown and described certainembodiments of my invention, it is to be understood that it -is capableof many modifications. Changes, therefore, in the construc- I tion andarrangement may be made without departing from the spirit and scope ofthe,

invention as disclosed in the appended claims, in which it is myintention to claim all novelty inherent in my invention as broadly aspossible in view of the prior art.

What I claim as new, and desire to secure by Letters Patent, is: v

1. In a jack, a casing, a lifting member slidable therein, said memberhaving a U- 'shaped cross-section, a rack secured within sait member,andliftin'g mechanism including pawls operable on said rack, said rackrcomprising a strip of U-shaped cross-section having notched edges, saidsections facing in the same direction, there being an appreciable spacebetween the notched edges of the racks and the inner sides of theflanges of the outer section. y

2. In a jack, a casing, a lifting member slidabletherein, said memberhaving a U- shaped cross-section, a rack secured within said member,lifting mechanism including pawls operable on said rack, said racklcomprising a strip of U-shaped cross-section having notched ed es, anopening in the bottom of said mem er and an end on said rack adapted toengage said opening.

4JOHNNY/ BATE.

